September weather forecast
Sullivan, NH

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Weather in September

September, the first month of the autumn in Sullivan, is still a pleasant month, with temperature in the range of an average high of 70°F (21.1°C) and an average low of 50.9°F (10.5°C).

Temperature

Sullivan in September experiences a gentle temperature dip, with average high-temperatures reducing from a moderately hot 78.1°F (25.6°C) in August to a pleasant 70°F (21.1°C). During September, Sullivan sees a mean low-temperature of 50.9°F (10.5°C).

Humidity

In September, the average relative humidity is 79%.

Rainfall

In Sullivan, during September, the rain falls for 9.3 days and regularly aggregates up to 0.79" (20mm) of precipitation. In Sullivan, during the entire year, the rain falls for 125.1 days and collects up to 11.69" (297mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In Sullivan, the average length of the day in September is 12h and 29min.
On the first day of September in Sullivan, sunrise is at 6:14 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:31 pm EDT.

Sunshine

In September, the average sunshine in Sullivan is 8.5h.

UV index

The average daily maximum UV index in September in Sullivan, New Hampshire, is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.
Note: A typical high UV index of 4 in September suggests the following recommendations:
Ensure safety - Imperative it is to shield skin and eyes from damage. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
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Frequently asked questions

What are the temperatures in Sullivan in September?

The average high-temperature, in September, in Sullivan, is 70°F (21.1°C), while the average low-temperature is 50.9°F (10.5°C).

What is the average humidity in September in Sullivan?

The average relative humidity in September in Sullivan is 79%.

How many days does it rain in September in Sullivan?

In Sullivan, during September, the rain falls for 9.3 days and regularly aggregates up to 0.79" (20mm) of precipitation.

When it does not snow in Sullivan?

In Sullivan, New Hampshire, snow does not fall in June through September.

Does it snow in Sullivan in September?

In Sullivan, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Sullivan have in September?

In September, the average day length is 12h and 29min.

What time are sunrise and sunset in September in Sullivan?

On the first day of September in Sullivan, New Hampshire, sunrise is at 6:14 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:31 pm EDT.

How long on average sun shines in September in Sullivan?

In Sullivan, New Hampshire, the average sunshine duration in September is 8.5h.

What is the UV index reading in September in Sullivan?

The average daily maximum UV index in September in Sullivan, New Hampshire, is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Sullivan, NH

Average temperature in September - Sullivan, NH
  • Average high temperature in September: 70°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (27.9°F).

  • Average low temperature in September: 50.9°F

The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).

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Average pressure in September
Sullivan, NH

Average pressure in September - Sullivan, NH
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Sullivan, NH

Average wind speed in September - Sullivan, NH
  • Average wind speed in September: 5.4mph

The windiest months (with the highest average wind speed) are January, February and March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

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Average humidity in September
Sullivan, NH

Average humidity in September - Sullivan, NH
  • Average humidity in September: 79%

The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is April (74%).

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Average rainfall in September
Sullivan, NH

Average rainfall in September - Sullivan, NH
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is July (1.3").
The driest month (with the least rainfall) is March (0.75").

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Average rainfall days in September
Sullivan, NH

Average rainfall days in September - Sullivan, NH
  • Average rainfall days in September: 9.3 days

The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is January (6.3 days).

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Average snowfall in September
Sullivan, NH

Average snowfall in September - Sullivan, NH
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.64").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Sullivan, NH

Average snowfall days in September - Sullivan, NH
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Sullivan, NH

Average daylight in September / Average sunshine in September - Sullivan, NH
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).

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Average sunshine days in September
Sullivan, NH

Average sunshine days in September - Sullivan, NH
  • Average sunshine days in September: 17.2 days

The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (13.8 days).

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Average UV index in September
Sullivan, NH

Average UV index in September - Sullivan, NH
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in September
Sullivan, NH

Average cloud cover in September - Sullivan, NH
  • Average cloud cover in September: 38

The months with the most cloud cover are February and March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).

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Average visibility in September
Sullivan, NH

Average visibility in September - Sullivan, NH
  • Average visibility in September: 5mi

The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).

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Sullivan, New Hampshire, USA

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